DM44
The Tektronix DM44 is a 3½-digit digital multimeter module with manual range switching and LED readout that attaches to the top of the 464, 465, 466, and 475. It replaced the DM40 and DM43.
Key Specifications
| DC V Range | 200 mV to 1.2 kV in 5 decade steps |
|---|---|
| DC V Accuracy | 0.1% of reading, ±1 Count |
| DC V Input Resistance | 10 MΩ, Removable internal wire strap to increase input resistance to 1000MΩ on 200mV and 2V Ranges |
| Max. Input | ±1200 V (DC + peak AC) between positive input and Common input/chassis, ±500 V (DC + peak AC) to Chassis |
| Resistance Range | 200 Ω to 20 MΩ in 6 decade steps |
| Resistance Accuracy | 200 Ω to 2 MΩ, 0.25%, ±1 count; 20 MΩ, 0.30%, ±1 count |
| Temperature Range (with HP6430 Probe) | −55 °C to +150 °C |
Links
- Lazy Electrons Tektronix 475A & DM44 Repair Page
- Tek 475A / DM44 repair by vintageTek Museum @ YouTube
Pictures
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475 with DM44
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466 with DM44
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Inputs (side panel)
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DM44 Board Top View - Installed in a 475A
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DM44 PCB/Module Side view
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DM44 PCB/Module Front view
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DM44 PCB/Module Top view
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DM44 PCB/Module PCB Trace side
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DM44 Install - Cutout in 475A Case
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DM44 installed in a 475
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DM44 Connectors to detach for removal from 475
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Underside of DM44
